[gtk] a11y: Stop using child-notify

[Matthias Clasen <matthiasc src gnome org>]

commit 77b781726624ba43e3672c856f13560dd5c23e90
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 7 02:20:29 2019 +0000

    a11y: Stop using child-notify
    
    This was showing up in the accessibility tests failing.

 gtk/a11y/gtknotebookpageaccessible.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gtk/a11y/gtknotebookpageaccessible.c b/gtk/a11y/gtknotebookpageaccessible.c
index 0f57c737b8..d79b603aba 100644
--- a/gtk/a11y/gtknotebookpageaccessible.c
+++ b/gtk/a11y/gtknotebookpageaccessible.c
@@ -243,6 +243,8 @@ gtk_notebook_page_accessible_new (GtkNotebookAccessible *notebook,
   GObject *object;
   AtkObject *atk_object;
   GtkNotebookPageAccessible *page;
+  GtkNotebook *nb;
+  GtkWidget *notebook_page;
 
   g_return_val_if_fail (GTK_IS_NOTEBOOK_ACCESSIBLE (notebook), NULL);
   g_return_val_if_fail (GTK_WIDGET (child), NULL);
@@ -258,9 +260,11 @@ gtk_notebook_page_accessible_new (GtkNotebookAccessible *notebook,
   atk_object->layer = ATK_LAYER_WIDGET;
 
   atk_object_set_parent (gtk_widget_get_accessible (child), atk_object);
+  nb = GTK_NOTEBOOK (gtk_accessible_get_widget (page->priv->notebook));
+  notebook_page = gtk_notebook_get_page (nb, child);
 
-  g_signal_connect (gtk_accessible_get_widget (page->priv->notebook),
-                    "child-notify::tab-label",
+  g_signal_connect (notebook_page,
+                    "notify::tab-label",
                     G_CALLBACK (notify_tab_label), page);
 
   return atk_object;